Heating-furnace



(ModeL) W. O. MILLER.

Heating Furnace.

No. 231,442. Patented Aug. 24,1880.

WITNESSES: [N VENTOR 1 M2 m TTORNEY PETERS. FHOTO-LITMOGRAFHER. WASHINGTON a C UNITED STATES PATENT OFFICE.

HEATING-FURNACE.

SPECIFICATION formingpart of Letters Patent No. 231,442, dated August 24, 1880. Application filed April 12, 1880. (ModeL) To all whom it may concern Be it known that I, WILLIAM G. MILLER,

' ,of East Liverpool, Ohio, have invented a new and useful Improvement in Heating-Furnaces, which improvement is fully set forth in the following specification, reference being bad to the accompanying drawings.

Similar letters of reference indicate corresponding parts.

My invention relates to that class of furnaces designed for heating buildings.

In the accompanying drawings, to which reference is made, and which form part of this specification, Figure l is an isometrical view. Fig. 2 is a section of the furnace, taken on line 2 2. Fig. 3 is a section of the same, taken on line 00 w,- and Fig. 4-, a section taken on line y 3 A represents the front of the furnace. B is the door-aperture. B is the tire-grate, B the combustion-chamber, and B the top of the chamber B c a are openings to the chambers c and c. a a are hot-air flues. O is the cold-air chamber; 0, the hot-air chamber. dd are sandchambers in the side walls of the chamber B D D are hot-air pipes placed in the fire-chamber B covering the same. D are hot-air pipes placed so as to form the back wall of the chamber B D are hot-air pipes placed back of the chamber B E is an opening for admission of cold air to the chamber 0.

The pipes D D, the number of which may be varied according to the size of the furnace or the pipes themselves, are placed in eleveninch walls at either side of the chamber B of which walls the inner one is four inches, made of fire-brick. Between the inner and outer section of these walls is a vacuum-chamber, d, three inches wide. The outer section of these walls is four inches thick, and may be made of common brick. The chamber d in these walls I fill with sand, compact as possible, around the several pipes, forming a close joint, thus preventing any gas escaping into either of the chambers O or G. Thesepipes D are placed over the chamber B but within it, forming the arch or covering just under the roof of the chamber B A space is left over these pipes D and below the covering B so that a heating-surface is made on the top of the pipes. By reference to the drawings it will be seen that these pipes D extend downward, and thus form a second back wall beyond the first one, represented by the pipes D In this way it will be seen that these hotair pipes present a heating-surface on both sides.

The furnace proper is constructed of the usual materials, and the hot-air pipes of cast or wrought iron.

Air is conveyed to the cold-air pipes through the flue E, and after it is heated it passes to the chamber 0, and from thence to the various parts of the building.

The furnace is placed in the cellar or other most convenient place, and to it air is conducted from the outside to the chamber 0.

\Vhen fire is applied to the chamber B heat is communicated to the pipes D, D, and D while the flame and smoke pass over the pipes D and down behind the same, and thence on up and behind the second wall of pipes D and so on to the exit-flue. A further continuation of these pipes may be made in this way and the heat still further utilized. I prefer to make these hot-air pipes of wrought or cast iron.

I am aware that furnaces have been used with heating-pipes formed into walls about which the heat and flames act, and 1 do not claim such, broadly; but

What I do claim is- The herein-described furnace, having the cold-air chamber 0 and the hot-air chamber 0 separated from each other by the doublewalled fire-place B with the interposed sandwalls 61 d, in combination with said lire-chambers B and with the walls of pipes D D forming the back and roof of the fire-place, and the secondary pipes D arranged back of the upright wall D, all of the pipes leading directly from the cold to the hot chamber, as shown and set forth. a

In testimony that I claim the foregoing as my invention I hereto set my hand in the presence of two witnesses.

WM. 0. MILLER.

Witnesses:

JOHN MILLER, HENDERSON E. DAVIS. 

